Thermal Performance of Solar Air Heater Having Absorber Plate with V-Down Discrete Rib Roughness for Space-Heating Applications

Figure 5

Enhancement in thermal performance due to artificial roughness (𝐿=2 m, 𝐻=10 mm, 𝑒/𝐷_ℎ=0.07, 𝜀_𝑝=0.95, 𝛽=45^∘, 𝑇_𝑖=295 K, 𝑇_𝑎=278 K, ℎ_𝑤=5 W/m² K).